{"id":"EUVD-2026-28351","revision":null,"records":[{"revision":"864851f1046f498dbce247aa25a7e847","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-41642","aliases":[],"title":"GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute","description":"GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. In version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as \"Well-known,\" the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). 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This issue has been patched in version 4.4.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px","https://github.com/osrg/gobgp/releases/tag/v4.4.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28351","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 7, 2026, 11:50:41 AM","dateUpdated":"May 7, 2026, 12:34:38 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. 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When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as \"Well-known,\" the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic). This issue has been patched in version 4.4.0.","state":0,"publishedAt":"2026-05-07T12:16:17.46+00:00","modifiedAt":"2026-10-26T22:10:00.163+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/osrg/gobgp/releases/tag/v4.4.0","https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-41642","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-476"],"productCriteria":["cpe:2.3:a:osrg:gobgp:4.3.0:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-07T12:16:17.460","lastModified":"2026-10-26T22:10:00.163"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-41642","identifiers":["CVE-2026-41642"]},"retained":false,"historicalAffected":[]},{"revision":"ded0c3554107435994fba4c566955da0","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-7235-89m6-f4px","aliases":["CVE-2026-41642","GO-2026-5198"],"title":"GoBGP has Remote Denial of Service (Panic) via Malformed Well-known Path Attribute","description":"### Summary\nA remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as \"Well-known,\" the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic).\n\n### Details\nThe vulnerability is located in the Finite State Machine (FSM) message handling loop in pkg/server/fsm.go.\nAccording to RFC 4271, any Path Attribute with the Optional bit set to 0 is treated as \"Well-known.\" If the Type Code is unrecognized, the BGP speaker MUST send a NOTIFICATION message.\n\nIn GoBGP v4.3.0, when such an attribute (e.g., Type 0xEE or 0xFF with flags 0x40) is received, the parsing layer identifies the error. However, the logic in recvMessageloop (around Line 1826) does not properly halt execution. It proceeds to reference the body of the parsed message. Because the message was deemed invalid during the initial attribute check, the body pointer is nil, leading to:\npanic: runtime error: invalid memory address or nil pointer dereference.\n\nThis bypasses the intended error-handling mechanism and causes the entire BGP daemon to terminate, rather than just closing the affected session.\n\n```\npanic: runtime error: invalid memory address or nil pointer dereference\n[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0xc225e4]\n\ngoroutine 50 [running]:\ngithub.com/osrg/gobgp/v4/pkg/server.(*fsmHandler).recvMessageloop(0x19f29bca92c0, {0x10069f0, 0x19f29bc48780}, {0x1014658, 0x19f29bc2a890}, 0x19f29baa0540, 0x19f29bc393b0, 0x19f29bc96cc0?)\n        /home/base/Desktop/gobgp/pkg/server/fsm.go:1826 +0xa44\ncreated by github.com/osrg/gobgp/v4/pkg/server.(*fsmHandler).established in goroutine 37\n        /home/base/Desktop/gobgp/pkg/server/fsm.go:1916 +0x2d5\nexit status 2\n\n```\n\n### PoC\nGoBGP Version: v4.3.0\nConfigure GoBGP with a neighbor (e.g., 192.168.31.195) in passive mode.\nEstablish a standard BGP session (OPEN/KEEPALIVE exchange).\nSend a specifically crafted UPDATE packet containing an unrecognized Type Code marked as \"Well-known\" (Optional bit = 0).\nPayload 1 (Hex):\n```\nFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF\n00 17                # Length: 23\n02                   # Type: UPDATE\n00 00                # Withdrawn Routes Length: 0\n00 04                # Total Path Attribute Length: 4     \n40 EE 00             # Flag: 0x40 (Well-known, Transitive), Type: 0xEE (Unknown), Len: 0\n```\nPayload 2 (Hex):\n```\nFF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF\n00 17                # Length: 23\n02                   # Type: UPDATE\n00 00                # Withdrawn Routes Length: 0\n00 04                # Total Path Attribute Length: 4     \n40 01 01 00          # IGP Attribute\n40 FF 00             # Flag: 0x40 (Well-known, Transitive), Type: 0xFF (Unknown), Len: 0\n```\n### Impact\nThis vulnerability affects all GoBGP deployments peering with external or internal speakers. A single malformed UPDATE message from any peer can trigger a nil pointer dereference, causing the GoBGP daemon to panic and crash.","state":0,"publishedAt":"2026-04-29T20:43:36+00:00","modifiedAt":"2026-07-24T19:11:42.5960641+00:00","affected":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.3.0"},{"kind":"fixed","version":"4.4.0"}]}],"versions":["4.3.0"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px","https://nvd.nist.gov/vuln/detail/CVE-2026-41642","https://github.com/osrg/gobgp","https://github.com/osrg/gobgp/releases/tag/v4.4.0"],"sourceUrl":"https://github.com/advisories/GHSA-7235-89m6-f4px","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-7235-89m6-f4px","identifiers":["GHSA-7235-89m6-f4px","CVE-2026-41642","GO-2026-5198"]},"retained":false,"historicalAffected":[]},{"revision":"404a44d23caf4a03abf69e435e7f6cd2","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5198","aliases":["CVE-2026-41642","GHSA-7235-89m6-f4px"],"title":"GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute in github.com/osrg/gobgp","description":"GoBGP: Remote Denial of Service (Panic) via Malformed Well-known Path Attribute in github.com/osrg/gobgp","state":0,"publishedAt":"2026-07-24T18:35:55+00:00","modifiedAt":"2026-07-24T19:00:21.5529678+00:00","affected":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.3.0"},{"kind":"fixed","version":"4.4.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px","https://github.com/osrg/gobgp/releases/tag/v4.4.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5198","license":"OSV · upstream source license applies","key":"osv:GO-2026-5198","identifiers":["GO-2026-5198","CVE-2026-41642","GHSA-7235-89m6-f4px"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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